Dragline bucket

ABSTRACT

A dragline bucket comprises a base member, a first side member extending from the base member and including a first top edge, a second side member extending from the base member, and a rear member extending from the base member and including a second top edge, a mouth for receiving material into the bucket, and a first beveled wall extending from the first side member forming a first compound angle with the base member and a second beveled wall extending from the rear member proximate the first beveled wall forming a second compound angle with the base member.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application is a Broadening Reissue application of U.S. Pat. No.10,544,562 which issued on Jan. 28, 2020 from U.S. patent applicationSer. No. 15/493,405 filed Apr. 21, 2017, the contents of which areincorporated herein by reference in their entirety.

TECHNICAL FIELD

The present disclosure relates to bucket and rigging assemblies that areused in dragline mining operations and the like. More specifically, thepresent disclosure relates to a dragline bucket assembly that includesbeveled walls near the rear of the bucket assembly.

BACKGROUND

Referring initially to FIG. 1, bucket assemblies 100 have beentraditionally used with rigging assemblies 102 that use a lower spreaderbar 104 positioned above the rear attachment points 106 (usuallytrunnion type connections with trunnion links are provided) of thebucket assembly 100 to help keep the hoist chains 108, from which thebucket assembly 100 is suspended, from contacting the edges 110 of thewalls such as the sidewalls 112 of the bucket assembly 100 during usesuch as when material is loaded into or dumped out of the bucket 114. Ifsuch contact or rubbing occurs as the pulling chains 116 (shown to beattached via a clevis link) make the bucket move, the chains 108 maywear over time and need replacement, requiring downtime for maintenancethat could lead to loss profits for a mining operation or the like.Also, the spreader bar 104 helps to position the chains 108 so that thechains do not inhibit the filling of the bucket 114 or dumping of thebucket 114.

However, such spreader bars 104 are very heavy, putting a load on thehoist chains 108 and on the machine (not shown) using the bucketassembly 100, and may themselves wear. This too can lead to requiredmaintenance. Also, the machine may have to exert more energy, resultingin higher operation costs for the mining operation or the like.Furthermore, the weight of the spreader bar 104 limits the capacity ofthe bucket 114, affecting the efficiency of the mining operation.

Consequently, various designs have been developed to eliminate the needfor a lower spreader bar 104. One such design has included altering thegeometry of the rear of the bucket 114, such as by angling, beveling ormitering the sidewall 112 as desired near the rear of the bucket 114, todecrease the risk of the chain 108 at a rear attachment point 106 of thebucket 114 from rubbing on an edge 110 of the bucket 114. However, thesebuckets 114 tend to be long, rendering them less efficient thandesirable when loading the bucket 114 with material in use (e.g. it maytake longer to fill or empty such buckets). Also, the placement of theattachment points 106 do not maintain balance of the bucket 114 asmaterial is loaded into the bucket in a desirable manner. Another designhas placed the attachment points 106 or trunnions inside of the bucket114, but this tends to limit or interfere with the loading or dumping ofmaterial into or out of the bucket 114. In other cases, the trunnionsare placed on the rear wall but this may not be ideal in terms ofmaintaining balance of the bucket as material is loaded into the bucket.

Accordingly, it is desirable to develop a better design for a draglinebucket to help eliminate the need for a spreader bar in the riggingassembly than has yet been devised.

SUMMARY OF THE DISCLOSURE

A dragline bucket according to an embodiment of the present disclosurecomprises a base member, a first side member extending from the basemember and including a first top edge, a second side member extendingfrom the base member in an opposing manner to the first side memberdefining a distance from the first side member to the second sidemember, and a rear member extending from the base member and including asecond top edge. The first side member, second side member and basemember define a mouth for receiving material into the bucket, and afirst beveled wall extends from the first side member and a secondbeveled wall extends from the rear member proximate the first beveledwall. The first beveled wall forms a first compound angle with the basemember and the second beveled wall forms a second compound angle withthe base member that is different than the first compound angle.

A dragline bucket according to an embodiment of the present disclosurecomprises a base member, a first side member extending from the basemember and including a first top edge, a second side member extendingfrom the base member in an opposing manner to the first side memberdefining a distance from the first side member to the second sidemember, and a rear member extending from the base member and including asecond top edge. The first side member, second side member and basemember define a mouth for receiving material into the bucket, and afirst beveled wall extends from the first side member and a firstmitered wall extends from the first side member proximate the firstbeveled wall, the first beveled wall forming a first compound angle withthe base member and the first mitered wall forming a lower obtuse anglewith the first side member.

A dragline bucket according to an embodiment of the present disclosurecomprises a base member, a first side member extending from the basemember and including a first top edge, a second side member extendingfrom the base member in an opposing manner to the first side memberdefining a distance from the first side member to the second sidemember, and a rear member extending from the base member and including asecond top edge. The first side member, second side member and basemember define a mouth for receiving material into the bucket, the rearmember defines a rear internal extremity of the bucket, and the bucketdefines a fill direction and a center of gravity and a Cartesiancoordinate system including a X-axis, Y-axis, a Z-axis and an originpositioned at the center of gravity, wherein the X-axis is aligned withthe fill direction of the bucket, the bucket further defines a filldepth parallel to the X-axis measured from the mouth to the rearinternal extremity of the rear member. A first trunnion attachmentstructure is attached to the bucket a first predetermined distance awayfrom the rear internal extremity along the X-axis, and a ratio of thefirst predetermined distance to the fill depth ranges from 15 to 45%.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate several embodiments of thedisclosure and together with the description, serve to explain theprinciples of the disclosure. In the drawings:

FIG. 1 is a perspective view of a dragline bucket that is suspendedusing hoist chains attached to a lower spreader bar in the riggingassembly as is known in the art.

FIG. 2 is a perspective view of a bucket assembly according to anembodiment embodiments of the present disclosure that includes aplurality of beveled or mitered walls near the rear of the bucket.

FIG. 3 is a front view of the bucket assembly of FIG. 2.

FIG. 4 is side view of the bucket assembly of FIG. 2.

FIG. 5 is a top view of the bucket assembly of FIG. 2.

FIG. 6 is a bottom view of the bucket assembly of FIG. 2.

FIG. 7 is a rear view of the bucket assembly of FIG. 2.

FIG. 8 is a top sectional view of half of the bucket assembly of FIG. 4,the section taken along the horizontal plane of the pin slot.

FIGS. 9 thru 12 are various perspective views of the trunnion attachmentstructure employed as part of the rear attachment points of the bucketassembly of FIGS. 2 thru 8.

FIG. 13 is an enlarged section view of the trunnion attachment structureshown in FIG. 8 taken at a lower level than the section of FIG. 8.

FIG. 14 is an enlarged view of the trunnion attachment structure shownin FIG. 4.

FIG. 15 illustrates the bucket assembly of FIG. 2 used with a riggingassembly lacking a lower spreader bar.

FIG. 16 is a rear sectional view of the bucket and rigging assemblies ofFIG. 15, with the bucket and rigging assemblies cut in half along themidplane of the assemblies.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the disclosure,examples of which are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or like parts. In some cases, a referencenumber will be indicated in this specification and the drawings willshow the reference number followed by a letter for example, 100a, 100bor by a prime for example, 100′, 100″ etc. It is to be understood thatthe use of letters or primes immediately after a reference numberindicates that these features are similarly shaped and have similarfunction as is often the case when geometry is mirrored about a plane ofsymmetry. For ease of explanation in this specification, letters andprimes will often not be included herein but may be shown in thedrawings to indicate duplications of features, having similar oridentical function or geometry, discussed within this writtenspecification.

In various embodiments, a bucket assembly or bucket that uses aplurality of beveled walls that reduce the likelihood of a hoist chainrubbing on an edge of the bucket is provided while also lessening thelikelihood that a void will form in the rear of the bucket when thebucket is loaded with material. In other embodiments, a bucket assemblyor bucket is that uses a beveled wall to reduce the likelihood of ahoist chain rubbing on an edge of the bucket is provided along with amitered wall located beneath the beveled wall where the trunnionattachment structure is disposed, helping to protect the trunnionattachment structure from wear as material passes over the trunnionattachment structure as the bucket is loaded. In yet furtherembodiments, the trunnion attachment structure is positioned from therear wall and from the center of gravity appropriate distances tomaintain the desired balance as the bucket is filled with material.

Looking now at FIGS. 2 thru 8, a bucket assembly 200 according to anembodiment of the present disclosure will now be described that mayallow the elimination of a lower spreader bar while also improving theability to fill the rear of the bucket 202. The bucket assembly 200 maycomprise a bucket 202 including a base member 204, a first side member206 including a first top edge 208 extending from the base member 204, asecond side member 206′ extending from the base member 204 in anopposing manner to the first side member 206 defining a distance D206from the first side member 206 to the second side member 206′, and arear member 210 including a second top edge 212 extending from the basemember 204. The first side member 206, second side member 206′ and basemember 204 define a front ring or mouth 214 for receiving material intothe bucket 202. For this embodiment, the first and second side members206, 206′ extend forward of the mouth 214, defining forward facingprojections 216 (sometimes referred to as drag lugs) that provide clevispin compatible attachment points 218 and an arch 220 that extends fromthe frontmost portion of top edges 208, 208′ of the first and secondside members 206, 206′. Two arch attachment points 224 are provided atthe top of the arch 220. Other configurations for the first and secondside members are possible. Also, the arch may be omitted or a bail maybe provided, etc.

The front edge of the base member 204 is covered or protected by variousdevices such as edge protectors 222 (sometimes referred to as shrouds)and ground engaging tools 225. The ground engaging tools 225 areattached to the front edge using tool adapters 226. In otherembodiments, a continuous edge protector or base edge may be attached tothe front edge of the base member 204. In yet further embodiments, anyform of front edge protection may be omitted.

Looking toward the rear of the bucket 202, a first beveled wall 228 mayextend from the first side member 206 and a second beveled wall 230 mayextend from the rear member 210 proximate the first beveled wall 228.The first beveled wall 228 forms a first compound angle α1 (best seen inFIG. 7) with the base member 204 and the second beveled wall 230 forms asecond compound angle α2 (best seen in FIG. 7) with the base member 204that is different than the first compound angle α1. The change in anglebetween the first compound angle α1 and the second compound angle α2allows the bucket to transition from the first side member 206 to therear member 210 while also providing the first beveled wall 228 with afirst function and providing the second beveled wall 230 with a secondfunction. The first function of the first beveled wall 228 is todecrease the likelihood of a hoist chain rubbing on a top edge 208 ofthe bucket 202 while the function of the second beveled wall 230 is todecrease the likelihood of a void being created as material fills intothe corner of the rear of the bucket 202.

More specifically, the first beveled wall 228 includes a third top edge232 connected to the first top edge 208 of the first side member 206 andthe second beveled wall 230 includes a fourth top edge 234 connected tothe second top edge 212 of the rear member 210. Also, the first beveledwall 228 may be connected to the second beveled wall 230 such that thethird top edge 232 of the first beveled wall 228 is connected directlyto the fourth top edge 234 of the second beveled wall 230. At least aportion of the rear member 210 forms a third angle β (best seen in FIG.4) with the base member 204. The angles of the rear member, firstbeveled wall and second beveled walls allow these portions of the bucketto overhang the interior of the bucket, making it less likely thatmaterial will fall out of the bucket as material is loaded into thebucket.

The bucket 202 defines a fill direction F and a center of gravity C anda Cartesian coordinate system including a X-axis, Y-axis, a Z-axis andan origin O positioned at the center of gravity C. As shown in FIGS. 2thru 8, the X-axis is aligned with the fill direction F of the bucket202, and the first compound angle α1 includes a first component angle γ1(best seen in FIG. 4) projected along the Y-axis onto the X-Z plane anda second component angle γ2 (best seen in FIG. 3) projected along theX-axis onto the Y-Z plane, and the first component angle γ1 ranges from50 to 85 degrees and the second component angle γ2 ranges from 50 to 80degrees.

Similarly, the second compound angle α2 includes a third component angleθ1 (best seen in FIG. 4) projected along the Y-axis onto the X-Z planeand a fourth component angle θ2 (best seen in FIG. 3) projected alongthe X-axis onto the Y-Z plane, and the third component angle θ1 rangesfrom 60 to 80 degrees and the fourth component angle θ2 ranges from 50to 85 degrees. Also, the third angle β (best seen in FIG. 4) the rearmember 210 forms with the base member 204 is projected onto the X-Zplane along the Y-axis and ranges from 60 to 80 degrees and may beapproximately 70 degrees in some embodiments.

With continued reference to FIGS. 2 thru 8, a In one or more otherembodiments, a lower spreader bar may be eliminated while alsoprotecting a rear trunnion attachment structure 236 of bucket assembly200′ according to an embodiment of the present disclosure will now bedescribed that may allow the elimination of a lower spreader bar whilealso protecting a rear trunnion attachment structure 236 of the bucket200. The In such embodiment, the bucket 202′ 202 may include a basemember 204, a first side member 206 including a first top edge 208extending from the base member 204, a second side member 206′ extendingfrom the base member 204 in an opposing manner to the first side member206 defining a distance D206 from the first side member 206 to thesecond side member 206′, and a rear member 210 including a second topedge 212 extending from the base member 204 as previously described.Also, the first side member 206, second side member 206′ and base member204 define a mouth 214 for receiving material into the bucket 202.

A first beveled wall 228 extends from the first side member 206 and afirst mitered wall 238 extends from the first side member 206 proximatethe first beveled wall 228, the first beveled wall 228 forming a firstcompound angle α1 with the base member 204 and the first mitered wall238 forming a lower obtuse angle φL (best seen in FIG. 8) with the firstside member 206. The rear trunnion attachment structure 236 extends atleast partially from the first mitered wall 238.

As previously described, the bucket defines a fill direction F and acenter of gravity C and a Cartesian coordinate system including aX-axis, Y-axis, a Z-axis and an origin O positioned at the center ofgravity C. The In one or more embodiments, the X-axis is aligned withthe fill direction F of the bucket 202′ 202, and the first compoundangle α1 includes a first component angle γ1 (best seen in FIG. 4)projected along the Y-axis onto the X-Z plane and a second componentangle γ2 (best seen in FIG. 3) projected along the X-axis onto the Y-Zplane, and the first component angle γ1 ranges from 50 to 85 degrees andthe second component angle γ2 ranges from 60 to 80 degrees. The lowerobtuse angle φL (best seen in FIG. 8) is projected onto the X-Y planealong the Z-axis and the lower obtuse angle φL ranges from 150 to 170degrees and may be approximately 160 degrees in some embodiments.

TheIn one or more embodiments, the bucket 202′ 202 may further comprisea second beveled wall 230 connecting the first beveled wall 228 to therear member 210 and a second mitered wall 240 connecting the firstmitered 238 wall to the rear member 210. As best seen in FIG. 14, thefirst beveled wall 228, the second beveled wall 230, the first miteredwall 238 and the second mitered wall 240 may all be positionedimmediately adjacent each other, forming a four way intersection 242. Inaddition, transitional walls 244 such as radii 244a, 244b may be used toconnect the second beveled wall 230 and the second mitered wall 240,respectively, to the rear member 210. The transitional walls 244 244c,22d, 244e may continue from the rear to the bottom of the bucket 202′202, blending the first mitered wall 238 and the first side member 206to the base member. Ribs 246 may be provided on the bottom of the basemember 204 (see FIG. 8) and the bottom transitional walls 244 244e,244d. The bucket may be symmetrical about the X-Z plane. The third andfourth top edges 232, 234 may be coplanar with the second top edge 212.

As can be understood with reference to FIG. 8, another lower obtuseangle (not specifically pointed out) may be formed between the secondmitered wall 240 and the rear member 210 that is projected along theZ-axis onto the X-Y plane that ranges from 130 to 150 degrees and may beapproximately 140 degrees in some embodiments. The second mitered wallmay also serve the purpose of helping to prevent the formation of a voidin the rear corner of the bucket as it fills. The side member and therear member may be substantially perpendicular to each other.

Next, referring back to FIGS. 2 thru 8, the in one or more embodiments,abucket assembly 200″ according to an embodiment of the presentdisclosure will now be described that provides 200 may further providegood balance as the bucket 202″ 202 is filled. The In such embodiments,bucket 200″ 200 comprises a base member 204, a first side member 206extending from the base member 204 and including a first top edge 208, asecond side member 206′ extending from the base member 204 in anopposing manner to the first side member 206 defining a distance D206from the first side member 206 to the second side member 206′, and arear member 210 extending from the base member 204 and including asecond top edge 212.

As shown in FIG. 8, the first side member 206, second side member 206′and base member 204 define a mouth 214 for receiving material into thebucket 202″ 202. The rear member 210 defines rear internal extremity 248of the bucket, and the bucket 202″ 202 defines a fill direction F and acenter of gravity C and a Cartesian coordinate system including aX-axis, Y-axis, a Z-axis and an origin O positioned at the center ofgravity C. The X-axis is aligned with the fill direction F of the bucket202″ 202, and the bucket further defines a fill depth 250 parallel tothe X-axis measured from the mouth 214 to the rear internal extremity248 of the rear member 210. A first trunnion attachment structure 236 isattached to the bucket 202″ 202 a first predetermined distance 252 awayfrom the rear internal extremity 248 (measured from the pin aperture 260of 236), and a ratio of the first predetermined distance 252 to the filldepth 250 ranges from 15 to 45% and may be approximately 35% in someembodiments.

Likewise, the center of gravity is positioned a second predetermineddistance 254 away from the mouth 214 along the X-axis and a ratio of thesecond predetermined distance 254 to the fill depth 250 ranges from 15to 35% and may be approximately 20% in some embodiments. The X-Z planedefines a midplane 256 (sometimes also a plane of symmetry) and thetrunnion attachment structure 236 defines a trunnion slot 258 with alongitudinal axis L258 that is parallel to the X-Z plane.

As mentioned earlier with reference to FIGS. 2 thru 8, a first beveledwall 228 extends from the first side member 206 toward the rear member210 and the first trunnion attachment structure 236 is disposed beneaththe first beveled wall 228 along a direction parallel with the Z-axis. Afirst mitered wall 238 extends from the first side member 206 toward therear member 210, the first mitered wall 238 being connected to the firstbeveled wall 228 and the first trunnion attachment structure 236 isdisposed on the first mitered wall 238.

Furthermore, as depicted in FIG. 4, a second beveled wall 230 extendsfrom the first beveled wall 228 to the rear member 210. The firstbeveled wall 228 includes a third top edge 232 forming an upper obtuseangle φU with the first top edge 208 of the first side member 206 thatis projected onto the X-Z plane along the Y-axis. The upper obtuse angleφU may range from 160 to 180 degrees and may be approximately 170degrees.

Turning now to FIGS. 8, and 9 thru 14, the construction and use of thetrunnion attachment structure 236 will now be described in more detail.The trunnion attachment structure 236 includes an attachment or baseplate 262 that is predominantly flat so that it may be attached to thefirst mitered wall 238. However, the bottom portion 264 of the baseplate 262 may be curved to match a transition wall 244 244d. Thetrunnion attachment structure 236 as shown is particularly well suitedto be cast. The back side of the trunnion attachment structure 236 maybe hollowed or cored out (see reference numeral 266) and a pad 268 mayextend from the base plate 262.

The pad 268 defines the trunnion slot and the pin aperture extendsorthogonally to the trunnion slot 258 for receipt of a pin 270 (vaguelyshown in FIGS. 15 and 16) that retains the trunnion link 272 (vaguelyshown in FIGS. 15 and 16) in the slot 258 in a manner known in the art.An elongated access aperture 274 is also provided so that the pin 270used to hold the trunnion link 272 in place may be accessed to attachand detach the trunnion link 272 from the trunnion attachment structure236. Side grooves 276 are provided on the pad 268 to maintain thenominal wall thickness of the part. The pad 268 further defines achamfered surface 278 that is positioned toward the front of thetrunnion attachment structure 236 so that material flowing past theoutside of the bucket 202 may be deflected by this chamfered surface278, reducing the wear on the trunnion attachment structure 236. Theorientation of the first mitered wall 238 and the attachment of thetrunnion attachment structure 236 to this wall allows the trunnionattachment structure 236 to be partially shielded from material as itflows past the bucket 202 (see FIG. 3 for example).

The bucket, trunnion attachment structure, etc. may be made from anysuitable material including iron, grey cast-iron, steel, etc. Also, thebucket, trunnion attachment structure, etc. may be integrally cast,forged or may be fabricated and assembled by fastening, welding, pressfitting, etc. two or more pieces together to form the bucket, bucketassembly, or the trunnion attachment structure.

Any of the dimensions, ratios, angles or configuration of the bucket,trunnion attachment structure, etc. may be varied as needed or desired.Also, the dimensions and ratios involving the center of gravity may bebased on the bucket as empty or with a payload depending on theapplication. Accordingly, values given and configurations shown aregiven by way of an example and not in any limiting sense.

INDUSTRIAL APPLICABILITY

In practice, a bucket, bucket assembly or trunnion attachment structureaccording to any embodiment described, shown or discussed herein may besold, bought, manufactured, remanufactured, retrofitted, assembled orotherwise obtained in an aftermarket or OEM context.

For example, a trunnion attachment structure or bucket may be used as areplacement part. The bucket or bucket assembly may be used with amachine that has a rigging subassembly 300 such as that shown in FIGS.15 and 16. The rigging assembly 300 as shown has no lower spreader barbut an upper spreader bar 302 is still employed. The upper spreader bar302 is in the same plane as the hoist chain 304 and the trunnion link272, helping to avoid twisting of the hoist chain 304, which may lead toincreased stresses in the chain. Also, the hoist chain 304 is spacedaway from the first beveled wall 228, creating clearance 306 so that thehoist chain 304 will not rub on the top edge of 232 the first beveledwall 228. Hence, no lower spreader bar is necessary. When the bucket isessentially horizontal, the hoist chain 304 makes an angle with thevertical direction (Z-axis as defined in FIGS. 2 thru 8, when projectedonto the X-Z plane along the Y axis) that may range from 0 to 20 degreesand may be approximately 10 degrees in some embodiments. Similarly, theangle 280 the hoist chain makes with the vertical direction whenprojected onto the Y-Z plane along the X-direction may range from 10 to45 degrees (see FIG. 16). These angles will change depending on theorientation of the bucket in use 202. The angle of attack or carry angle(bucket tilt), which is the angle the base member makes with a purelyhorizontal direction may vary from 0 to 40 degrees in some applications.

The configuration of the bucket shown in the figures is shorter alongthe fill direction, allowing a more efficient filling and dumpingprocess to be used when employing the bucket. Also, the balance of thebucket during fill and dumping may be better than buckets previouslyknown in the art. Furthermore, the capacity of the bucket may beincreased compared to previous bucket designs, given the reduction ofthe load due to the elimination of the lower spreader bar.

It will be appreciated that the foregoing description provides examplesof the disclosed assembly and technique. However, it is contemplatedthat other implementations of the disclosure may differ in detail fromthe foregoing examples. All references to the disclosure or examplesthereof are intended to reference the particular example being discussedat that point and are not intended to imply any limitation as to thescope of the disclosure more generally. All language of distinction anddisparagement with respect to certain features is intended to indicate alack of preference for those features, but not to exclude such from thescope of the disclosure entirely unless otherwise indicated.

Recitation of ranges of values herein are merely intended to serve as ashorthand method of referring individually to each separate valuefalling within the range, unless otherwise indicated herein, and eachseparate value is incorporated into the specification as if it wereindividually recited herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the embodiments of theapparatus and methods of assembly as discussed herein without departingfrom the scope or spirit of the invention(s). Other embodiments of thisdisclosure will be apparent to those skilled in the art fromconsideration of the specification and practice of the variousembodiments disclosed herein. For example, some of the equipment may beconstructed and function differently than what has been described hereinand certain steps of any method may be omitted, performed in an orderthat is different than what has been specifically mentioned or in somecases performed simultaneously or in sub-steps. Furthermore, variationsor modifications to certain aspects or features of various embodimentsmay be made to create further embodiments and features and aspects ofvarious embodiments may be added to or substituted for other features oraspects of other embodiments in order to provide still furtherembodiments.

Accordingly, this disclosure includes all modifications and equivalentsof the subject matter recited in the claims appended hereto as permittedby applicable law. Moreover, any combination of the above-describedelements in all possible variations thereof is encompassed by thedisclosure unless otherwise indicated herein or otherwise clearlycontradicted by context.

What is claimed is:
 1. A dragline bucket comprising: a base memberextending along an X-axis, a first side member extending from the basemember and including a first top edge, a second side member extendingfrom the base member in an opposing manner to the first side memberdefining a distance from the first side member to the second sidemember, and a rear member extending from the base member and including asecond top edge; wherein the first side member, second side member andbase member define a mouth for receiving material into the bucket; and afirst beveled wall extending from the first side member and a secondbeveled wall extending from the rear member proximate to intersect thefirst beveled wall and form an obtuse angle between the first beveledwall and the second beveled wall, the first beveled wall forming a firstcompound angle with the base member and the second beveled wall forminga second compound angle with the base member that is different than thefirst compound angle such that wherein the first beveled wall and thesecond beveled wall join together and each angle inward towards theX-axis to overhang the base member.
 2. The dragline bucket of claim 1,wherein the first beveled wall includes a third top edge connected tothe first top edge of the first side member and the second beveled wallincludes a fourth top edge connected to the second top edge of the rearmember.
 3. The dragline bucket of claim 2, wherein the first beveledwall is connected to the second beveled wall, and the third top edge ofthe first beveled wall is connected to the fourth top edge of the secondbeveled wall.
 4. The dragline bucket of claim 2 1, wherein at least aportion of the rear member forms a third angle with further comprising atrunnion attachment structure mounted on a trunnion attachment wallextending between the first beveled wall and the base member.
 5. Thedragline bucket of claim 1, wherein the bucket defines a fill directionand a center of gravity and a Cartesian coordinate system including athe X-axis, a Y-axis, a the Z-axis and an origin positioned at thecenter of gravity, wherein the X-axis is aligned with the fill directionof the bucket, and the first beveled wall forms a first compound angleincludes with the base member, the first compound angle including afirst component angle projected along the Y-axis onto the X-Z plane anda second component angle projected along the X-axis onto the Y-Z plane,and the first component angle ranges from 50 to 85 degrees and thesecond component angle ranges from 50 to 80 degrees.
 6. The draglinebucket of claim 5, wherein the second beveled wall forms a secondcompound angle includes with the base member, the second compound angleincluding a third component angle projected along the Y-axis onto theX-Z plane and a fourth component angle projected along the X-axis ontothe Y-Z plane, and the third component angle ranges from 60 to 80degrees and the fourth component angle ranges from 50 to 85 degrees. 7.The dragline bucket of claim 4, wherein the bucket defines a filldirection and a center of gravity and a Cartesian coordinate systemincluding a the X-axis, a Y-axis, a Z-axis and an origin positioned atthe center of gravity, wherein the X-axis is aligned with the filldirection of the bucket, and the third angle the rear member forms withthe base member is projected onto the X-Z plane along the Y-axis andranges from 60 to 80 degrees.
 8. A dragline bucket comprising: a basemember extending along an X-axis, a first side member extending from thebase member and including a first top edge, a second side memberextending from the base member in an opposing manner to the first sidemember defining a distance from the first side member to the second sidemember, and a rear member extending from the base member and including asecond top edge; wherein the first side member, second side member andbase member define a mouth for receiving material into the bucket; and afirst beveled wall extending from the first side member and a firstmitered wall extending from the first side member proximate below thefirst beveled wall and between the first beveled wall and the basemember, the first beveled wall forming a first compound angle with thebase member such that wherein the first beveled wall overhangs the basemember and the first mitered wall forming a lower obtuse angle with thefirst side angles outward and away from the base member.
 9. The draglinebucket of claim 8 further comprising a trunnion attachment structureextending at least partially from mounted below the first beveled wallon the first mitered wall.
 10. The dragline bucket of claim 8, whereinthe bucket defines a fill direction and a center of gravity and aCartesian coordinate system including a the X-axis, a Y-axis, a Z-axisand an origin positioned at the center of gravity, wherein the X-axis isaligned with the fill direction of the bucket, and the first beveledwall forms a first compound angle includes with the base member, thefirst compound angle including a first component angle projected alongthe Y-axis onto the X-Z plane and a second component angle projectedalong the X-axis onto the Y-Z plane, and the first component angleranges from 50 to 85 degrees and the second component angle ranges from50 to 80 degrees.
 11. The dragline bucket of claim 10, wherein thebucket defines a fill direction and a center of gravity and a Cartesiancoordinate system including a X-axis, Y-axis, a Z-axis and an originpositioned at the center of gravity, wherein the X-axis is aligned withthe fill direction of the bucket, and the lower obtuse angle isprojected onto the X-Y plane along the Z-axis and the lower obtuse angleranges from 150 to 170 degrees.
 12. The dragline bucket of claim ofclaim 11, further comprising a second beveled wall connecting the firstbeveled wall to the rear member.
 13. The dragline bucket of claim 12,further comprising a second mitered wall connecting the first miteredwall to the rear member.
 14. The dragline bucket of claim 13, whereinthe bucket is symmetrical about the X-Z plane.
 15. The dragline bucketof claim 1, wherein the first beveled wall forms a first compound anglewith the base member and the second beveled wall forms a second compoundangle with the base member that is different than the first compoundangle such that the first beveled wall and the second beveled walloverhand the base member.
 16. The dragline bucket of claim 8, furthercomprising a second beveled wall extending from the rear member tointersect and join together with the first beveled wall, wherein thesecond beveled wall overhangs the base member.
 17. The dragline bucketof claim 16, wherein the first beveled wall forms a first angle with thebase member and the second beveled wall forms a second angle with thebase member that is different than the first angle such that the firstbeveled wall and the second beveled wall each overhang the base member.18. The dragline bucket of claim 1, wherein the rear member isorthogonal to the X-axis, the dragline bucket further comprising atrunnion attachment wall extending away from the first side memberbetween the first beveled wall and the base member and forming an obtuseangle with the first side member; and a trunnion attachment structuremounted on the trunnion attachment wall, wherein the trunnion attachmentstructure comprises a base plate; a pad extending from the base plateand defining a trunnion slot with a longitudinal axis that is parallelto the X-axis; a pin aperture extending orthogonally to the trunnionslot; and a pin disposed in the pin aperture.
 19. The dragline bucket ofclaim 18, wherein the base plate of the trunnion attachment structure issubstantially parallel with the trunnion attachment wall.
 20. Thedragline bucket of claim 8, wherein the rear member is orthogonal to theX-axis, the dragline bucket further comprising a trunnion attachmentstructure mounted on the first mitered wall, wherein the trunnionattachment structure comprises a base plate; a pad extending from thebase plate and defining a trunnion slot with a longitudinal axis that isparallel to the X-axis; a pin aperture extending orthogonally to thetrunnion slot; and a pin disposed in the pin aperture.
 21. The draglinebucket of claim 20, wherein the base plate of the trunnion attachmentstructure is substantially parallel with the first mitered wall.
 22. Adragline bucket comprising: a base member extending along an X-axis, afirst side member extending from the base member and including a firsttop edge, a second side member extending from the base member, and arear member extending from the base member and including a second topedge; wherein the first side member, second side member and base memberdefine a mouth for receiving material into the bucket; a first beveledwall extending from the first side member and a first mitered wall belowthe first beveled wall and between the first beveled wall and the basemember, wherein the first beveled wall overhangs the base member and thefirst mitered wall angles outward and away from the base member; and atrunnion attachment structure mounted on the first mitered wall.
 23. Thedragline bucket of claim 22, wherein the first mitered wall extends fromthe first side member towards the rear member and forms an obtuse anglewith the first side member.
 24. The dragline bucket of claim 23, whereinthe trunnion attachment structure comprises a base plate; a padextending from the base plate and defining a trunnion slot with alongitudinal axis that is parallel to the X-axis; pin aperture extendingorthogonally to the trunnion slot; and a pin disposed in the pinaperture.